Bruegger's Bagels and Caribou Coffee customers have been advised to check their payment card information after the discovery of a data breach, according to a security notice from the company.

If you visited any company-owned Bruegger’s or Caribou Coffee locations between Aug. 28 and Dec. 3, there is a possibility that your name and credit card information — including card number, expiration date and card security code — may have been accessed.

The company was notified by Mandiant, a cybersecurity firm, on Nov. 30 that it had detected unauthorized access to Bruegger's point of sale systems, exposing some of its customers’ data.

Payments made through a Bruegger’s Bagel Inner Circle account or a customer loyalty account were not affected. Any catering orders placed online with Bruegger’s Bagels, Einstein Bros. Bagels, Manhattan Bagel and Noah’s NY Bagels were also not affected by this breach.

The company's president, Tyler Ricks, said they are making the necessary changes to strengthen their network against any future attacks and improve payment systems to protect customer information going forward.